Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df452e58c5de30b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-10 22:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 26a5f2718add2986722abf8a067602a9 SHA-1: 3bb10da5f1de49c544fd78ffc3ee03f67071583a SHA-256: 7df452e58c5de30b742df6f1b821ada17810b2699edd7e33e79023a0914adce9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially compromised websites, acting as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to trick users into downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://merwepizza.com/upload/file/tadatilixaxipomujeseji.pdf In PDF document text
    • http://megatex-plast.ru/pub/file/sifalajukuduranuv.pdfIn PDF document text
    • https://yasacompany.com/upload/files/93308825890.pdfIn PDF document text
    • http://artediapharma.com/upload/files/17467798725.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/32412752533.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/dagotiw.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/bomipuzakisorala.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbf9415094---furiwine.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/48552418359.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/50918075533.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/66836867740.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/82492312508.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161347ee881fec---49452350116.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/gizugudidivi.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/55984625891.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/munizelo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139459eac887---polipafedusozumujibo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb0121322---xokuwikitejefifaba.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/2966250517.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/16741942510.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/47847489690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bloom%27s+taxonomy+words+listPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B3 10664 bytes
SHA-256: 7af8a81ab3a271b781fa35adc9002277696d21505c1654d5b6ce0959059eaf8d
font_01_sfnt_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 17656 bytes
SHA-256: c6cb524729f358df1e6650f934e48b5328f95d0388dc3da6c6e1f39ab12303d2
font_02_sfnt_off000118ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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